For those interested in some of the academic work that underlies the analysis: Chapter Three on what we know about growth draws from this and this. Chapter Four on Malthus draws on this. Chapter Five about global progress in the quality of life draws on this, this, this, and this. In addition to the papers used in Chapter Five, Chapter Six on income and quality of life draws on this. Meanwhile, two CGD essays, Solow's Return: Inventions, Ideas and the Quality of Life (subsequently published here) and Getting Better in Pictures summarize the argument of the book --the first in an (ever so slightly) more technical direction, the second with graphs.